How to Configure FortiGate with Layer 3 Switch VLANs | Inter-VLAN Routing Explained

In this FortiGate tutorial, I explain a real-world enterprise network design where VLAN gateways are configured on a Layer 3 switch instead of the FortiGate firewall. Many network engineers get confused about what needs to be configured on FortiGate when inter-VLAN routing is already being performed by a Cisco Layer 3 switch. In this video, you'll learn the complete configuration including routed interfaces, static routes, firewall policies, NAT configuration, default routes, and traffic flow analysis. Topics Covered: ✅ Layer 3 Switch VLAN Configuration Overview ✅ FortiGate Routed Interface Configuration ✅ Static Routes for VLAN Networks ✅ Internet Access through FortiGate ✅ Firewall Policy Configuration ✅ NAT Configuration ✅ Cisco Switch Default Route Configuration ✅ End-to-End Traffic Flow Explanation ✅ Enterprise Network Design Best Practices ✅ FortiGate Interview Questions & Answers Lab Topology: VLAN 10 – Users Network VLAN 20 – Server Network Layer 3 Switch as VLAN Gateway FortiGate as Security Gateway Internet Access through FortiGate Firewall This video is useful for: FortiGate Administrators Network Engineers Security Engineers NSE Certification Students CCNA & CCNP Candidates SOC & NOC Engineers Enterprise IT Professionals If you're preparing for FortiGate interviews or working on enterprise firewall deployments, this practical configuration guide will help you understand how FortiGate integrates with Layer 3 switches in production environments. 👍 Like, Share & Subscribe for more FortiGate, Cisco, Firewall, VPN, SD-WAN, and Network Security tutorials. #fortigatevlanconfiguration #fortigatevlanconfigurationstepbystep #fortigatevlaninterface #FortiGate #Layer3Switch #VLAN #Cisco #NetworkSecurity #Firewall #SDWAN #Routing #CCNA #CCNP #NSE4 #FortiGate #CiscoSwitch #VLANConfiguration #FortiGateFirewall #NetworkSecurity #EnterpriseNetworking #StaticRouting #InterVLANRouting #FirewallPolicy #SDWAN #NetworkEngineer #CCNA #CCNP #NSE4 #FortiGateTutorial #CiscoNetworking #RoutingAndSwitching #ITInfrastructure